Fortunately I had taken a screenshot of FlightRadar at the time, 18:08:41, which you can see below along with the photographs taken either side of this at 18:06:35 and 18:09:59. At first I thought the plane looked to be turning round over East Kilbride and as you can see from the red circle on the screenshot which indicates where it was in the sky, it would have been on FlightRadar in this position but distance can be deceptive:"The plane was on radar. Get your facts right." on 29 September 2015 - Glasgow (3)
Well it turns out that the commentor was correct and this plane has been identified as the Glex from the FlightRadar screenshot above. Here is the full flight path taken from an online article and proof that the military are also heavily involved in geoengineering, not just commercial flights that fly past:
I'm pretty sure that from the evidence posted from yesterday that everyone can see that this was no "training" flight:
An RAF spokesman said the flight was a "routine" Sentinel mission - used for ground surveillance and mapping - adding "we fly, it's what we do".Sure it is.....